An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement is parsed, it is added via addStackElement. addStackElement has a check for the number of elements in this buffer, but it's off by 1, leading to a Heap Overflow of 1 element. The overflow is within the same structure so it can't affect adjacent memory blocks, and thus just leads to a crash while processing.
References
Link | Resource |
---|---|
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00018.html | Mailing List Third Party Advisory |
http://www.openwall.com/lists/oss-security/2020/04/23/1 | Mailing List Patch Third Party Advisory |
https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12521.txt | Third Party Advisory |
https://lists.debian.org/debian-lts-announce/2020/07/msg00009.html | Mailing List Third Party Advisory |
https://security.gentoo.org/glsa/202005-05 | Third Party Advisory |
https://security.netapp.com/advisory/ntap-20210205-0006/ | Third Party Advisory |
https://usn.ubuntu.com/4356-1/ | Third Party Advisory |
https://www.debian.org/security/2020/dsa-4682 | Third Party Advisory |
History
No history.
MITRE Information
Status: PUBLISHED
Assigner: mitre
Published: 2020-04-15T18:47:43
Updated: 2021-02-05T11:06:18
Reserved: 2019-06-02T00:00:00
Link: CVE-2019-12521
JSON object: View
NVD Information
Status : Analyzed
Published: 2020-04-15T19:15:12.393
Modified: 2021-07-21T11:39:23.747
Link: CVE-2019-12521
JSON object: View
Redhat Information
No data.